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Trump attacked Iran. Should Congress have had a say?

President Donald Trump with a red tie and blue suit speaks into a microphone in the White House.
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Carlos Barria/Reuters
President Donald Trump addresses Americans following U.S. strikes on Iran's nuclear facilities, accompanied by Vice President JD Vance, Secretary of State Marco Rubio, and Defense Secretary Pete Hegseth, at the White House, June 21, 2025.

The United States鈥 deep involvement in the 12-day-old Israel-Iran war, which may not be over despite a declared ceasefire, has reignited an age-old clash between Congress and the president: Who has the power to launch a U.S. military offensive 鈥 if not outright war 鈥 against another country?

The debate became especially charged this past weekend, when the U.S. bombed Iranian nuclear facilities in support of its ally, Israel, without advance authorization from Congress. At its root lies an inherent conflict within the U.S. Constitution, which empowers only Congress to declare war but makes the president commander in chief of the armed forces.

The Trump administration briefed top Republican lawmakers and the Senate Democratic leader on Saturday evening before the U.S. bombing of Iranian nuclear facilities聽early Sunday morning local time. But it wasn鈥檛 a request for authorization or a formal declaration of war; it was a heads-up. Meanwhile, top Democrats in Congress said Tuesday that they were still unclear about the president鈥檚 bombing decision and strategy.

Why We Wrote This

The Iran strikes raise questions about whether President Donald Trump鈥檚 actions align with the intent of the Constitution and the War Powers Resolution, but Republicans mostly stick with the president.

鈥淭his Trump is different from Trump 1.0 鈥 more ready to use military dominance, more willing to assert his authority by military actions domestically and internationally,鈥 says Harold Koh, a Yale Law School professor and former legal adviser to the State Department during the Obama administration.

鈥淐ongress has to make a serious effort to assert its authority here, or he鈥檒l just stop bothering to consult,鈥 Professor Koh adds.

The last time Congress made a formal declaration of war was in 1941, when it entered World War II after America was attacked at Pearl Harbor. Under more recent presidents, a legal mechanism called an Authorization for Use of Military Force 鈥 a joint resolution by Congress that authorizes the president to use the U.S. armed forces in specific military action 鈥 has served as the functional equivalent.

The House chamber in the U.S. Capitol is filled with seated lawmakers listening to President Franklin Roosevelt.
AP/File
The chamber of the U.S. House of Representatives was tense and packed as President Franklin Roosevelt told Congress and the nation that 鈥淥ur people, our territory, and our interests are in grave danger.鈥 He then asked for a declaration of war against Japan on Dec. 8, 1941.

In the run-up to the current U.S.-Iran hostilities, President Donald Trump kept the world guessing over whether he would join Israel鈥檚 effort to neutralize what it saw as an imminent nuclear threat from Iran. The answer became clear only after the American mission was finished, U.S. bombers had left Iranian airspace, and President Trump followed up with a .

A cloak of secrecy may have been necessary to pull off the attack. But with the prospect of continuing war, including potentially more Iranian retaliatory strikes on U.S. bases in the Middle East, debate is raging over Congress鈥 role as a coequal branch of government.

Views on the Constitution, split by party

At a time of intense political polarization, most members of Congress fall along party lines. One outlier, Republican Rep. Thomas Massie of Kentucky, responded bluntly on the social platform to Mr. Trump鈥檚 announcement Saturday night of a 鈥渧ery successful attack鈥 on three Iranian sites: 鈥淭his is not Constitutional,鈥 he wrote.

On the flip side, Republican House Speaker Mike Johnson that the strikes on Iran鈥檚 nuclear facilities were 鈥渃learly within President Trump鈥檚 Article II powers鈥 in the U.S. Constitution as commander in chief. Therefore, the speaker added, it is the War Powers Resolution of 1973, which requires the president to win congressional consent before committing U.S. forces to combat, that is unconstitutional.

Some Democrats are equally adamant that the legislative branch is the only branch authorized to commit U.S. forces to combat.

鈥淭he Constitution is clear. Only Congress has the power to declare war,鈥 Democratic Sen. Elizabeth Warren of Massachusetts told the Monitor. 鈥淭he president of the United States does not have authority under the Constitution to attack another nation, absent an emergency and a need to protect American troops, American citizens, or the homeland.鈥

Still, the Democrats are not moving in lockstep, with some expressing frustration that more have not signed on to resolutions drawn up in the Senate by Democrat Tim Kaine of Virginia and in the House by Representative Massie and Democratic Rep. Ro Khanna of California.

Democratic Rep. Ro Khanna, in a blue suit, sits at a desk, facing a computer screen, as he takes part in a podcast interview.
Francis Chung/Politico/AP
Democratic Rep. Ro Khanna of California is seen in his Capitol Hill office as he takes part in a podcast interview with political commentator Glenn Beck, May 20, 2025.

The Massie-Khanna measure would block further U.S. military involvement in the war, but on Monday, Mr. Massie said he would withdraw the resolution if there was a ceasefire.

Democratic Reps. Jim Himes, Gregory Meeks, and Adam Smith introduced a separate resolution Monday to cease hostilities in Iran absent congressional authorization. Representative Meeks told the Monitor that the new resolution closes a 鈥渓oophole鈥 in聽the Massie-Khanna resolution that, he says, would have prevented the U.S. from defending allies if they were attacked.

In addition, a handful of progressive House Democrats 鈥 including Rep. Alexandria Ocasio-Cortez of New York 鈥 called for Mr. Trump鈥檚 impeachment over the bombing of Iran, but House leadership has sidestepped the suggestion.

After both Israel and Iran announced a ceasefire, they continued to attack each other鈥檚 territory.

Mr. Trump, speaking to reporters early Tuesday as he left the White House for a NATO summit in The Hague, used profanity 鈥 rare for a president to do publicly 鈥 when he expressed his frustration about the war.

鈥淭hey don鈥檛 know what the [redacted] they鈥檙e doing,鈥 said the president, who had campaigned last year on ending 鈥渇orever wars.鈥

Awaiting news of Iran鈥檚 nuclear program

Also delaying action on Capitol Hill was the postponement of classified briefings on the war for members of both houses of Congress by administration officials. One key question is the state of Iran鈥檚 nuclear program after the U.S. bombing. The Senate briefing has been rescheduled for Thursday, while the timing of the House briefing remains unclear.

Senator Kaine, who sponsored a War Powers Resolution to bar Mr. Trump from taking further military action in Iran without congressional approval, said Monday that he expected the briefing would be an important factor in some members鈥 decisions.

Republican Sen. Mike Rounds of South Dakota, speaking to the Monitor, says that Congress鈥 slowness to act argues in favor of leaving war decisions to the president.

鈥淚 think the Founding Fathers laid this out correctly,鈥 Senator Rounds says. 鈥淲e have a commander in chief. You cannot have Congress today holding up what would be a very important item of protecting our national interests based upon the debate speed at which Congress moves.鈥

鈥淲e can debate it afterwards,鈥 he adds.

Still, lining up congressional support in advance of military action can strengthen a president鈥檚 hand, says Curtis Bradley, a law professor at the University of Chicago and an expert on foreign relations law.

鈥淪ometimes presidents are stronger if they can show adversaries, 鈥業 have not just me behind this; I have the full legislative branch to represent the American people,鈥欌 Professor Bradley says.

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